Driveway Sealing Weather in St. Augustine, FL: 10-Day Windows & Best Months

Q: What temperature do you need to seal a driveway?

55–90°F and rising, with the first night at 50°F or better. The 'rising' part is why St. Augustine's February start matters: sealing on the front of a warm spell, not the back. Pavement lags air — a shaded slab can fail a passing afternoon.

Q: How long after rain can I sealcoat?

24 hours after the last 0.05"+ rain, and only once cracks and shade strips are visibly dry — asphalt pores hold water after the surface grays out. In St. Augustine's August (46% rain days) that lookback eats most of the calendar; April barely notices it.

Q: How long does driveway sealer take to dry before rain or cars?

Plan 36 rain-free, car-free hours (labels range 24–48; shade and cool nights need the long end). A 0.05"+ shower inside the window streaks the coat gray. April is St. Augustine's easiest month to find that window; August the hardest.

Q: Can you seal a driveway in the fall?

Yes, until the nights quit. The 50°F overnight rule closes St. Augustine's season after June; the classic October mistake is a 62°F Saturday over a 41°F night. Spring restarts around February when pavement warms.

Q: How often should a driveway be sealed?

When the surface tells you: graying, no beading, spreading hairlines — typically every 2–4 years. In St. Augustine's mild winters the drivers are UV and rain, not freeze-thaw — watch beading, not the calendar. Fresh asphalt waits 6–12 months.

Q: Best month to seal a driveway in FL?

May tops St. Augustine's table at 23 days clearing the 55–90°F-rising, 50°F-night, 36-dry-hour stack; May and April together carry the season. Check the FL state page for how the ranking shifts across the state.

The driveway sealing season in St. Augustine runs February through June — 10 months averaging at least 8 workable days by NOAA 1991–2020 normals. The single best month is May, averaging 23 days that clear every check — highs of 85°F, lows near 67°F, and a 25% daily rain chance. Below: today through day 10 against the label rules, then the year at a glance.

GOOD — every label check passes MARGINAL — one soft fail NO — hard fail or several soft

The rules this check uses

The St. Augustine verdicts run on these rows — consensus pail numbers with one editorial call: 36 cure hours, the honest middle of the 24–48 range labels print.

Typical label thresholds for driveway sealing — the ruleset behind every St. Augustine verdict above.
Check	Threshold	Why it matters
Air temperature	55–90°F, and rising	The film (or mix) chemistry runs on temperature — both while you work and for the first hours after.
Overnight low	≥50°F during the first 24 h	Curing continues after dark; the first night can undo a perfect afternoon.
Dry before	≤0.05" rain in the prior 24 h	Checked backward from your start hour using the two look-back days in the forecast data.
Dry after	<0.05" rain for 36 h after (48 h cool or shaded driveways want 48 h)	The engine sums forecast rain hour by hour through the cure window for St. Augustine.
Evening dew-point spread	≥5°F from 6–11 pm	When air temperature meets the dew point, water condenses on your fresh work first.
Daytime humidity	≤85%	Read as the daytime maximum, 10 a.m.–5 p.m.; within 3 points of the limit counts as marginal.
Wind	≤20 mph (dust and debris in wet sealer up to 28 mph)	Strong wind drops leaves and grit into the wet coat.

Always follow your product label — formulas vary. The table above is the typical range across major manufacturers, not a promise about your can.

Best months for driveway sealing in St. Augustine

St. Augustine's calendar, scored: each month's days passing the temperature rules, discounted by that day's historical rain odds (NOAA 1991–2020). Not a forecast.
Month	Avg high	Avg low	Rain odds/day	Workable days
January	68°F	48°F	29%	0
February	70°F	50°F	28%	12
March	74°F	55°F	27%	23
April	80°F	61°F	24%	23
May	85°F	67°F	25%	23
June	89°F	72°F	39%	18
July	91°F	74°F	41%	0
August	90°F	74°F	46%	10
September	87°F	73°F	44%	17
October	82°F	66°F	31%	21
November	75°F	58°F	27%	22
December	69°F	51°F	28%	16

Figure 185 workable days a year in St. Augustine, spread across February through June. Shoulder months turn on the overnight rule: an afternoon at 70°F passes, but the 50°F night floor is what actually opens the season in February. The Florida table ranks every listed city by the same math.

July here fails on heat, not rain: the average high of 91°F sits over the 90°F label ceiling, and 31 of 31 days typically top 90°F. Midsummer work moves to dawn or waits for May.

The rain odds swing hard across the year — 24% of days in April up to 46% in August. Season the plan accordingly: prep in the wet months, apply in the dry ones.

Pouring before you seal? Concrete in St. Augustine trades the pavement-warmth rule for a 48-hour freeze watch.

Source honesty: every monthly figure on this page is the 1991–2020 normal at St Augustine Lighthouse, Fl Us, 2.4 km from St. Augustine's center — your block's shade lines and wind exposure sit on top of that baseline. Scoring details are on the methodology page.

St. Augustine by the numbers

Hottest month: July — 91°F average high, 31 days topping 90°F.
The cold floor is January at 68°F afternoons and 48°F overnight.
Measurable rain: August leads at 46% of days; April is the quiet end at 24%.
The 50°F-night season spans February–December here.
Bottom line for St. Augustine: roughly 185 workable driveway sealing days a year.

Prep checklist

Wait for a rising pair: 55°F+ and climbing, first night over 50°F, 36 dry hours — in St. Augustine that pattern lives February through June.
Day-before job: crack filler in every crack, so it cures before the sealcoat lands.
Hit oil spots with degreaser and sweep hard; sealer over dust peels in playing-card flakes.
Check yesterday, not just today: 24 h under 0.05" of rain. St. Augustine's April makes that nearly automatic at 24% rain-day odds.
Tape the garage slab and sidewalk lines with edging tape — drips on concrete are forever.
Pull thin passes with a squeegee/brush combo, back-brushing the texture as you go.
Start early at the top of the slope: a May morning coat gets the whole 85°F afternoon to break before dew.
Keep tires off through the full cure — with May nights at 67°F, shaded strips need the long end of 24–48 h.

Gear that saves a window

Transparency note: gear links here become affiliate links only when the program is enabled — today they are plain references. See the affiliate disclosure.

Squeegee/brush combo
Pull with the squeegee, back-brush the texture.
Driveway sealer, 5-gal
Coverage runs 250–400 sq ft per pail — measure first.
Edging tape
Keeps the garage slab and sidewalk edges black-free.
Crack filler
Fill cracks a day ahead so filler cures before sealer.

FAQ

What temperature do you need to seal a driveway?

55–90°F and rising, with the first night at 50°F or better. The 'rising' part is why St. Augustine's February start matters: sealing on the front of a warm spell, not the back. Pavement lags air — a shaded slab can fail a passing afternoon.

How long after rain can I sealcoat?

24 hours after the last 0.05"+ rain, and only once cracks and shade strips are visibly dry — asphalt pores hold water after the surface grays out. In St. Augustine's August (46% rain days) that lookback eats most of the calendar; April barely notices it.

How long does driveway sealer take to dry before rain or cars?